I'm not sure if this is the method used by Mr. Andrus for his yellow ball(because I've not seen his presentation), but it is the simplest and most direct method I can think of for the question at hand. There was an effect once sold at various magic shops (perhaps it still is) called the "Chinese Egg Bag". It was only about $4.00. In effect, a flexible, woven bamboo(?) placemat was held in front of you by one edge (the top). The bottom edge was brought up in front to meet the top edge, as the top edge was released. You were now holding the opposite edge, and showing the back side of the mat. This was repeated as often as you wanted to cleanly show both sides of the mat. All the while you were only using your forefinger and thumb to hold the mat. Your other fingers were outstretched, and obviously empty. The mat was formed into a tube, and a wooden egg was rolled out. Other productions and vanishes followed, but it sounds like a possible solution for Brad's question. The method was very easy, and could be adapted to fit the Rubik's Cube. No holdout is needed, no revesre topit, and being a dove worker, I can safely say that producing a square/cube shaped object using a dove harness-type loop is not as simple as a torpedo-shaped bird. Possible, yes. Practical, not very. The egg, or in this case, the cube, is hanging from a loop on the thumb of the hand holding the top of the mat. The cube is hanging behind the mat. The opposite hand brings up the bottom of the mat in the front, still hiding the cube. As the bottom edge meets the top edge, the top edge is let go, and falls, becoming the new bottom edge. The cube never moves. It simply hangs behind the mat the entire time. When it's time to make the tube, you bring the bottom edge up BEHIND the cube (instead of the front), roll the tube, release the cube - voila! The length of the mat (or paper) needs to be at least double the distance from your thumb to the bottom of the hanging cube. The width will depend on the angles from your audience, and whether they can see behind the mat. I realize while reading this, it sounds too simple to really work. But believe me, I have adapted this over the years to produce all sorts of objects that size. I have been asked to produce small corporate products, awards, even that special anniversary ring in a box. It really is a fooler. It may not be your final solution. I'm just tossing the idea into the pool for you.
- David Oliver